If you have a student or client with tongue thrust (as known as oral myofunctional disorder) you may need some information about the jaw.
Learn more about the jaw here and see my resources for therapy ideas on Teachers Pay Teachers.com.
The vowels are often affected by the position of the jaw. If you are teaching English pronunciation to a foreign-born speaker, they may improve their low vowels /ae/ as in /cat/, and /ah/ as in /pot/, if they open their mouth wider (move their jaw to a low jaw position).
See my free printable English Vowel Quadrilateral here.
See my free printable Mouth Openings Pictures & Words Page here.
The entire Tongue Thrust/Jaw Stability handout packet is available on TeachersPayTeachers.